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US 2017/0081204 A1Published application
Process for producing high grade hydromagnesite and magnesium oxide
AssigneeKarnalyte Resources Inc.
InventorsRobin Phinney, Jonathon Phinney, Siu Ma
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Abstract
The present invention provides a process for producing high purity hydromagnesite from a source of magnesium chloride. The process involves preparation of a magnesium chloride brine of a specific concentration, which is ammoniated at a specific temperature range, followed by carbonation, while maintaining the reaction at a specific temperature range to form a hydromagnesite precipitate. The product can be calcined to generate high purity magnesium oxide compounds.
Claims31
A method of preparing hydromagnesite from a source of magnesium chloride, comprising:
- a) preparing a feedstock brine solution from said source of magnesium chloride, wherein said feedstock brine solution comprises magnesium chloride and calcium chloride;
- b) mixing a sulfate salt into said feedstock brine solution to convert said calcium chloride into a calcium sulfate precipitate;
- c) removing said calcium sulfate precipitate from said feedstock brine solution;
- d) ammoniating said feedstock brine solution produced in step c) at a temperature range of about 20° C. to about 60° C. to convert magnesium chloride at least partially into magnesium hydroxide and to form ammonium chloride;
- and
- e) carbonating said magnesium hydroxide while maintaining the reaction temperature at about 20° C. to about 120° C. to form a hydromagnesite precipitate.
3 more elements
A method of preparing a magnesium oxide product, comprising:
- a) preparing a feedstock brine solution from a source of magnesium chloride, the feedstock brine solution comprising a magnesium chloride and calcium chloride;
- b) mixing a sulfate salt into said feedstock to convert said calcium chloride into a calcium sulfate precipitate;
- c) removing said calcium sulfate precipitate from said feedstock to form a brine solution comprising water soluble impurities;
- d) ammoniating said brine solution produced in step c) at a temperature range of about 20° C. to about 60° C. to convert magnesium chloride at least partially into magnesium hydroxide and to form ammonium chloride;
- e) carbonating said magnesium hydroxide while maintaining the reaction temperature at about 20° C. to about 120° C. to form a hydromagnesite precipitate;
- f) washing said hydromagnesite precipitate to remove said water soluble impurities;
- g) drying said hydromagnesite precipitate after washing to produce a dried hydromagnesite precipitate, wherein said step of drying is carried out at a temperature of between about 100° C. and about 150° C.;
- and
- h) calcining the dried hydromagnesite precipitate form said magnesium oxide product.
6 more elements
A hydromagnesite product, said hydromagnesite product formed
- a) preparing a feedstock brine solution from a source of magnesium chloride, said feedstock brine solution comprising magnesium chloride and calcium chloride;
- b) mixing a sulfate salt into said feedstock to convert said calcium chloride into a calcium sulfate precipitate;
- c) removing said calcium sulfate precipitate from said feedstock to form a brine solution comprising water soluble impurities;
- d) ammoniating said brine solution produced in step c) at a temperature range of about 20° C. to about 60° C. to convert magnesium chloride at least partially into magnesium hydroxide and to form ammonium chloride;
- e) carbonating said magnesium hydroxide while maintaining the reaction temperature at about 20° C. to about 120° C. to form a hydromagnesite precipitate;
- f) washing said hydromagnesite precipitate to remove said water soluble impurities;
- and
- g) drying said hydromagnesite precipitate after washing to produce a dried hydromagnesite precipitate, wherein said step of drying is carried out at a temperature of between about 100° C. and about 150° C.
5 more elements
A magnesium oxide product, said magnesium oxide product formed using a method comprising the steps of:
- a) preparing a feedstock brine solution from a source of magnesium chloride, said feedstock brine solution comprising magnesium chloride and calcium chloride;
- b) mixing a sulfate salt into said feedstock to convert said calcium chloride into a calcium sulfate precipitate;
- c) removing said calcium sulfate precipitate from said feedstock to form a brine solution comprising water soluble impurities;
- d) ammoniating said brine solution produced in step c) at a temperature range of about 20° C. to about 60° C. to convert magnesium chloride at least partially into magnesium hydroxide and to form ammonium chloride;
- e) carbonating said magnesium hydroxide while maintaining the reaction temperature at about 20° C. to about 120° C. to form a hydromagnesite precipitate;
- f) washing said hydromagnesite precipitate to remove said water soluble impurities;
- g) drying said hydromagnesite precipitate after washing to produce a dried hydromagnesite precipitate, wherein said step of drying is carried out at a temperature of about 100° C. to about 150° C.;
- and
- h) calcining the dried hydromagnesite precipitate form said magnesium oxide product.
6 more elements
A method of preparing hydromagnesite from a source of magnesium chloride, comprising:
- a) preparing a magnesium chloride brine solution from said source of magnesium chloride, wherein the concentration of said magnesium chloride brine solution is up to about 35% by weight of magnesium chloride, and
- b) ammoniating said magnesium chloride brine solution at a temperature range of about 20° C. to about 60° C. to convert magnesium chloride at least partially into magnesium hydroxide;
- c) carbonating said magnesium hydroxide while maintaining a reaction temperature at about 20° C. to about 120° C. to form a hydromagnesite precipitate.
Dependencies are inferred from the claim text.